eal: return errors on device event callback unregister

Fix return value, using -EAGAIN instead of 0 when the callback is busy
and using -ENOENT instead of 0 when the callback is not found.

Fixes: a753e53d517b ("eal: add device event monitor framework")
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Acked-by: Jeff Guo <jia.guo@intel.com>
Acked-by: David Marchand <david.marchand@redhat.com>

diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
index 363a2ca95e5ed4f61755b470aa26c625a3a536e1..d990bfd20dfef07096d146a406686d01580c0cde 100644 (file)
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -530,9 +530,15 @@ rte_dev_event_callback_unregister(const char *device_name,
                        free(event_cb);
                        ret++;
                } else {
-                       continue;
+                       ret = -EAGAIN;
+                       break;
                }
        }
+
+       /* this callback is not be registered */
+       if (ret == 0)
+               ret = -ENOENT;
+
        rte_spinlock_unlock(&dev_event_lock);
        return ret;
 }